rabbits reproduce and stuff

sillyFibRabbits.py

#! /usr/bin/env python3

#from http://rosalind.info/problems/fib/
def rabi(n,m):
    a = [1,1,2]
    if (n < 4):
        return a[n-1]
    else:
        for i in range(2, n):
            a.append(a[i-1] - a[i-(m-1)])
        print(a)
        return a[-1]

inp = input()
n = int(inp.split()[0])
 = int(inp.split()[1])
print(rabi(n,m))